Rubber heel.



c. T. MADDOCK RUBBER HEEL.

APPLICATION FILED MAYIfi. m9.

1,325 ,3671, Patented Dec. 16,1919.

I INVENTOR.

C/ar/f 7. /7 44/ 6/001? .ATTOWY5 OHIO, ASSIGNOR OF ONE-HALF T 3. G. SCHULLIAN, OF I CLEVELAND, OHIO.

omen r. Ivrznonoczr, or ELYRIA,

RUBBER; HEEL.

Specifioatipn 01' Letters Patent.

Patented Else. 1%, 191$.

Application filed ma 15, 1919. Serial No 297,298.

- the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The present invention relates to rubber heels or lifts such as are used on the heels of boots or shoes, and has for one object the provision of a lift which will be retained tightly against the heel around the outside e go, and also one of increased resilience over the usual type of li'ft,'due tothe construction of center portion thereof.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed drawing and the following description setting forth in detail certain mechanism embodying the inven tion, such disclosed means constituting, however. but one of various mechanical forms in which the principle of the inven tion may be used.

In said annexed drawing 1- Figure 1 a top plan of my lift; 2 is a bottom plan; Fig. is a section on the line 3-3, Fig. l; and Fig-4 is section at right angles to 3, as shown by the line ll, Fig. 1.

The present lift which is designed to be attached to the heel of a boot or shoe, is

shaped as shown in Fig. 1 to fit the heel on which it is to be applied, and is provided with a relatively fiat upper surface 1 adapted to contact with the heel of the shoe, and to be attached thereto by means of nails passing; through holes 2. Washers or small plates 3 of metal are embedded in the hee! as shown in Figs. 1, 3 and hand are for the purpose of preventing the nails from pullino. through the lift. surface ofthe lift is a circular recess The walls 5 of the recess 41 are slanted downwardly and on a slant away from the opening thereof, whereby the recess isof larger diameter at the bottom than at the top. The bottom or base oi the recess isvcrowned or convex, the uppermost portion or surface 15. thereof being a slight distance below the Disposed in the upper heel as the greater part of the weight surface of the upper face of the lift, whereby a space is left between the lift and the lower face of the heel to which it is attached.

The lower face or tread 6 of the lift is formed as best shown in Figs. 3 and 4, and is provided with a relatively flat surface 7., having a cricular depression 8 in the surface thereof. This depression in cross section consists of a compound curve, being concave adjacent its circumference and convex at the center, the lowermost portion of the convex portion 9 being on the same plane as the surface of the tread.

The recess 4 and the depression 8 are concentric with each other, and, as will be seen from Figs. 3 and 4c, the greatest depth of the concave portion 10 of the depression 8 in the lower face of the tread is approximately 0pposits the lowermost edge of the recess 1n the upper part or" the tread. It will thus be seen that the amount of material between these two points is relatively less than through of the li 't is adapted to move upward if any obstruction. is met while the lift is in use, thereby absorbing to a great extent any ar which would otherwise be "felt.

It will also he noted that the depression 8 does not extend to the edge ofthe lift, but

terminates a short space therefrom, thereby forming swearing surface or flange ll c0mpletely aroundfthe depression. By this arrangement I am able to obtain an appreciable suction between the lone taco ot-thc tread and the surface with which it is in contact. which to very large extent eliininates the tendency to slip or slide on a wet surface, which is usually t'ound to the case with most lifts or heels of this class.

By constructing a rubber lift or heel in the manner shown, I have obtained a heel which is both resilient and long wearing, and

bymcans of the space in the upper surface thereof, the convex portion in the depression on the tread surface is allowed a play or movement when the weight ot a person is on it. and also equalises the wear on the I will be taken up by the outer edges. It will also be seen that a less amount of material 18 required than in the usual heel, at the same time retaining the resiliency and long wearing qualities so much desired in heels or lifts of this type.

' stated means be employed.

I therefore particularly point out and distinctly claim asmy invention z 1. A rubber heel having a recess in the upper surface, the bottom of such recess being convex, and having a depression in its lower surface provided with a convcx'central portion having its central portion normally lying in the plane of the tread surface of the heel.

2; A rubberheelrhaving a recess in the upper surface, the bottom of such recess being convex, the upper surface of such convex bottom being'below the plane of the upper surface, and having a depression in its lower surface provided with a convex central portion having its central portion normally lying in theplane of the tread surface of the heel.

3. A-rubber heel having a recess in the upper surface, the bottom of such recess being convex, and having a-depression in its lower surface provided with a convex central portion,.the lower surface of sucheconvex central portion being in the plane of the tread surface of said heel.

{L A rubber heel having a recess inthe upper surface, the bottom of such recess be ing'convex, and having lower surface, such depression being concentric with such recess in the upper surface of said heel, the central portion between such recess and such depression lying withwith a convex central portion,

a depression in its in the planes of. the upper andqlower sursuch recess and such depression is of greater.

thickness than any other portion therebetween. p

6. A rubber heel having substantially flat and parallel upper and lower surfaces, the upper surface thereof being provided with a recess having a convex bottom, the lower edge of such recess being of greater diameter than the upper edge, and the lower surface having a depression therein provided central portion of the heel between such recess and such depression is of greater thick-.

ness than any other portion therebetween, the lower surface 0 such convex central portion bein surface 0 said heel.

whereby the on the sam plane as thelower therein pro- 7. A rubber heel havmg a recess in the upper surface, the bo tom of such recess being convex, vex portion being below the upper surface of said heel, and having a depression in its lower surface provided with a convex cen-' tral portion, the lower surface of such convex central portion being in the plane ofthe bottom surface of said heel, the thickness of the material between the outermost edges of such recess and such depression being less than through any other portion of said heel the upper surface of such oon- .v

whereby independent movement may be imparted to the center portion of the heel. V Signed by me this 14th day of May, 1919.

CLARK T. MADDOGK. 

